Insert adapter 1687/10 into air intake sleeve 1 and secure it with a clamp.
Prepare the VAG 1687 boost tester to perform the test (fig. 2.223).
Completely unscrew the pressure regulator 2 and close valves 3 and 4 (fig. 2.224).
NOTE: To rotate pressure regulator 2, its handle must be pulled upwards.
Connect the turbocharger tester VA G 1687 as shown in Figure 2.223.
Connect to compressed air source 1 (main line or compressor) vAG 1687 turbocharging system tester.
NOTE: If there is water in the collection cup, drain it through drain plug 6.
Open valve 3.
Using regulator 2, set the pressure to 0.5 bar.
CAUTION: The maximum pressure must not exceed 0.5 bar. Higher pressure may cause engine damage.
Open valve 4 and wait until the circuit is filled with compressed air. If necessary, set the pressure regulator back to 0.5 bar.
Check for leaks by listening and passing your hand near suspicious areas. You can also use leak detection spray or the VA G 1842 ultrasonic noise detector.
NOTE: Minor leaks are acceptable in the turbocharger intake area as the intake hoses are not designed for excess pressure.
NOTE: A small amount of air enters the engine through the valves. For this reason, it is not possible to check the residual pressure.
Operation of the VAG 1842 ultrasonic noise detection device.
When eliminating the detected leak, follow the instructions for performing installation work in the supercharging system.
Before removing the adapters, relieve the pressure in the circuit by removing the coupling from the 1687/10 adapter.
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